diff --git a/recipes-core/images/netmodule-linux-image.bb b/recipes-core/images/netmodule-linux-image.bb
index c4ab1aa..57e6231 100644
--- a/recipes-core/images/netmodule-linux-image.bb
+++ b/recipes-core/images/netmodule-linux-image.bb
@@ -98,6 +98,6 @@ LICENSE = "BSD"
 
 IMAGE_OVERHEAD_FACTOR = "1.0"
 OSTREE_BOOTLOADER = "u-boot"
-OSTREE_BRANCHNAME ?= "${LAYERSERIES_CORENAMES}-${MACHINE}"
+OSTREE_BRANCHNAME = "${LAYERSERIES_CORENAMES}-${MACHINE}"
 
 BUILDNAME = "${EXTERNALSRC_GIT_SRCREV};${DATETIME};${PN}"